# Transient and sub-transient reactance of synchronous machine

**URL:** <https://forum.plexim.com/t/transient-and-sub-transient-reactance-of-synchronous-machine/860>\
**Category:** PLECS\
**Tags:** synchronous-machine, transient-reactance, sub-transient-reactance, short-circuit-faults\
**Created:** [September 18, 2020, 5:42am UTC](https://forum.plexim.com/t/transient-and-sub-transient-reactance-of-synchronous-machine/860 "2020-09-18T05:42:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![malepatisankar](https://avatars.discourse-cdn.com/v4/letter/m/ba9def/32.png) [@malepatisankar](https://forum.plexim.com/u/malepatisankar)\
**Post date:** [September 18, 2020, 5:42am UTC](https://forum.plexim.com/t/transient-and-sub-transient-reactance-of-synchronous-machine/860/1 "2020-09-18T05:42:30Z")

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Hi,

Sub-transient reactance and transient reactance will control the behavior of synchronous machine during short circuit faults. In the synchronous machine models available in PLECS library, the sub-transient reactance and transient reactance are not included in model.

Does that mean such a short circuit faults can not be simulated in PLECS? I am looking for the synchronous machine models which can accept sub-transient reactance and transient reactance also.

Thanks,

Malepati Sankar